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Introduction 1 Scope and objectives 1 Methods of investigation 2 Acknowledgments 2 Well-, spring-, and site-numbering system 2 Geologic setting 2 Groundwater system 5 Occurrence of ground water 7 Aquifer characteristics 11 Potentiometric surfaces 15 Recharge and discharge 19 Water quality 22 Hydrologic effects of underground mining 26 Effects of mine dewatering 26 Effects of subsidence above underground mines 28 Summary 30 References cited 31 Contents III IV Contents Chemical concentration and water temperature are given in metric units. Chemical concentration is given in milligrams per liter (mg/L) or micrograms per liter. Milligrams per liter is a unit expressing the concentration of chemical constituents in solution as weight (milligrams) of solute per unit volume (liter) of water. One thousand micrograms per liter is equivalent to 1 milligram per liter. For concentrations less than 7,000 mg/L, the numerical value is about the same as for concentrations in parts per million. Water temperature is given in degrees Celsius (°C), which can be converted to degrees Fahrenheit (°F) by the following equation:°F =1.8(°C)+32

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